聚乙烯吡咯烷酮修饰碳糊电极法测定水中苯酚.docVIP

聚乙烯吡咯烷酮修饰碳糊电极法测定水中苯酚 王凯雄1 徐娟宝1 臧荣春1 彭图治2 王国顺2 ( 1 浙江农业大学环境科学系, 杭州 310029; 2 杭州大学化学系, 杭州 310028) 摘 要 提出了以聚乙烯吡咯烷酮 (PV P r) 修饰碳糊电极测定水中苯酚的方法. 在 0. 1 m o l?L KC l 的酚试液中开路富集后, 在磷酸盐缓冲液介质 (pH 5. 6) 中溶出, 用微分脉冲伏安法测定, 苯酚 的溶出峰电位为+ 0. 73 V (A g2A gC l 参比电极) , 检测限为 0. 05 Λg?L. 应用该法测定了废水中苯酚 的含量, 并讨论了该法测定苯酚的影响因素, 比较了几种修饰电极测定苯酚的灵敏度, 探讨了苯酚 在该修饰电极上的富集机理. 关 键 词 中图分类 苯酚; 聚乙烯吡咯烷酮; 修饰碳糊电极 O 625. 31; O 657. 1 W ang K a ix iong 1; X u J u anbao1; Z ang R ong ch u n1; P eng T u z h i2; W ang G u osh u n2 (1 D ep t. of E nv i2 ron. S c i. , Z h ej iang A g r icu l tu ra l U n iv e rs ity , H ang z h ou 310029, C h ina; 2 D ep t. of C h em is t ry H ang z h ou U n iv e rs ity , H ang z h ou 310028, C h ina ) D e term ina t ion of trace leve ls of phen o l in wa ter by po lyv in y lprro l idon e m od if ied carbon pa ste e lec2 trode. Jo u rna l o f Zh e jiang A g r itu ltu ra l U n ive r sity, 1996, 22 (3) : 249～ 253 T h e de te rm ina t io n o f p h eno l by d iffe ren t ia l p u lse vo ltamm e t ry (D PV ) w ith a ca rbo n A bstrac t p a ste e lec t ro de m o d if ied w ith 10% (W ?W ) po lyv iny lp r ro lido ne ( PV P r ) w a s stud ied. T h is e lec2 t ro de show ed st ro ng re spo n se to p h eno l and th e de tec t io n sen sit iv ity w a s m uch h igh e r th an o rd i2 na ry ca rbo n p a ste e lec t ro de. T h e p h eno l w a s p reco ncen t ra ted in 0. 1 m o l?L KC l so lu t io n du r ing op en c ircu it. T h e p reco ncen t ra ted p h eno l a t th e e lec t ro de w a s th en de te rm ined in p ho sp h a te buffe r so lu t io n (pH 5. 6). T h e o x ida t io n p eak po ten t ia l w a s + 0. 73 V (v s. A g2A gC l). T h e de tec t io n lim it m ea su red w a s 0. 05 Λg?L. T h e m e tho d h a s been app lied to th e de te rm ina t io n o f p h eno l in w a ste w a te r. A t th e sam e t im e, th e e lec t ro ch em ica l reac t io n m ech an ism o f p h eno l a t th is e lec t ro de w a s stud ied by th e cyc lic vo ltam